Players · H · Pitcher · 2026
Seth Halvorsen
- Age
- 26
- B/T
- R/R
- Height
- 6' 2"
- Weight
- 243 lb
- Number
- #56
- Born
- February 18, 2000 in Chicago, IL, United States
- MLB debut
- August 30, 2024
- Drafted
- 2018, round 30
- College
- Tennessee
- High school
- Heritage Christian
- dbWAR
- -.5 3 season(s)
- IP
- 29.0
- ERA
- 5.90
- FIP
- 6.17
- K/9
- 7.1
- FIP−
- 148 100 = avg
Seth Halvorsen is a relief pitcher for the Colorado Rockies. In 2026 he struck out 23 batters over 29.0 innings across 32 appearances, going 1-2. His ERA of 5.90 is 41.1% higher than the league average of 4.18 — 14th of 21 on his team, and 478th of 538 among MLB pitchers with 20+ innings. Stripping out defence, his 6.17 FIP suggests the ERA was no fluke. He missed bats on 21.0% of swings (10.2% of every pitch he threw), walked 12.1% of the batters he faced and struck out 16.3%. His -0.5 dbWAR is built from that FIP rather than runs allowed, so it credits him for what he controls and not for the defence behind him.
League context
Percentile among qualified pitchers, 2026.
WAR by season
Pitching
Standard and advanced, by season.
Platoon splits
How left- and right-handed hitters fare against him.
| Split | PA | AB | H | HR | BB | SO | AVG | OBP | SLG | wOBA | K% |
|---|---|---|---|---|---|---|---|---|---|---|---|
| vs LHB | 58 | 47 | 17 | 2 | 9 | 8 | .362 | .483 | .553 | .449 | 13.8% |
| vs RHB | 83 | 75 | 16 | 4 | 8 | 15 | .213 | .289 | .440 | .318 | 18.1% |
Pitch sequencing
What Seth Halvorsen throws in each count, and what he follows each pitch with. Select any cell for the breakdown.
Select a count to see exactly what Seth Halvorsen throws in it.
Pitch arsenal
What he throws, how hard, how often it misses, and what hitters do with it.
| Four-Seam Fastball | 313 | 98.9 | 2,310 | 40.3% | 11.8% | 68 | .324 | .999 | |
| Slider | 151 | 86.6 | 2,634 | 43.0% | 38.7% | 36 | .139 | .427 | |
| Splitter | 48 | 89.5 | 1,602 | 45.8% | 25.0% | 15 | .333 | 1.145 | |
| Sinker | 10 | 98.0 | 2,118 | 30.0% | 0.0% | 3 | — | — |
Head to head
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Similar players
Nearest 2026 seasons by command, run prevention and role, on rate statistics rather than totals.
wOBA uses linear weights measured from this season's own play-by-play rather than published constants, and wRC+ is park-adjusted against that same league. dbWAR is our own open implementation — not fWAR or bWAR — and the full derivation, including its simplifications, is on the methodology page.